module Game.Entities.Exit (mkExit) where

import Game.Entities.Common
import Game.Entities.Const
import Game.Entities.Types
import qualified Game.Sprites as S

mkExit :: S.SpriteSheet -> Int -> Int -> Collision -> IO Entity
mkExit sprites x y playerCollision = do
  s <- S.get sprites "exit"
  pure
    Entity
      { typ = TypePickup,
        x = x,
        y = y,
        delay = frameDelay,
        frame = 0,
        jumping = False,
        gravity = gravityOff,
        dir = DirRight,
        sprite = s,
        update = updateExit playerCollision,
        destroy = False,
        actions = []
      }

updateExit :: Collision -> Entity -> IO Entity
updateExit touchedPlayer e = do
  touched <- if e.frame < fullyOpen then pure False else touchedPlayer e
  pure $ if touched then e {destroy = True, actions = [ActionExitLevel]} else update
  where
    fullyOpen :: Int
    fullyOpen = 7

    update :: Entity
    update
      | e.delay > 0 = e {delay = e.delay - 1}
      | e.frame + 1 < frameLimit e = e {delay = frameDelay, frame = e.frame + 1}
      | otherwise = e {delay = frameDelay, frame = fullyOpen}